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uses Windows;

type
WinIsWow64 = function( Handle: THandle; var Iret: BOOL ): Windows.BOOL; stdcall;

function IAmIn64Bits: Boolean;
var
HandleTo64BitsProcess: WinIsWow64;
Iret : Windows.BOOL;
begin
Result := False;
HandleTo64BitsProcess := GetProcAddress(GetModuleHandle('kernel32.dll'), 'IsWow64Process');
if Assigned(HandleTo64BitsProcess) then
begin
if not HandleTo64BitsProcess(GetCurrentProcess, Iret) then
Raise Exception.Create('Invalid handle');
Result := Iret;
end;
end;